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So i picked up some dwarf sag today and its got this fuzzy looking stuff and im not really sure what it is. I got it with some java moss and they were bagged together but this looks nothing like the moss.
I have that on a few of my grassy plants as well. I think it's thread algae or staghorn algae. It started off single strand so I thought thread, but now it is more bushy and branched, so I wonder staghorn. I have another post about it that I just started. Hopefully we will both find out! I'm using H2O2 to get rid of the algae right now. I couldn't pick it off. It was stuck tightly.
That looks like thread or hair algae or possibly stag horn algae . I would get rid of that if it was me. I would not have put that in my tank. It will spread if that's what it is.